Switching system



June l2, 1928. 1,673,015

P. s. MURPHY SWITCHING SYSTEM Filed March 31, 1927 l 2 Sheets-Sheet 1 f "qm EMNL I wallHI- AAAI Non um QPL l IIIH Hill mk um mtl Arron/fr 70u FF/cE June l2, 1928.

P. B. MURPHY SWITCHING SYSTEM Filed March 31. 1927 2 sheets-sheet 2 Patented June 12, 1928.

:PAU-L B. ll/IUBflPHjY, 0F -NEYACK, YORK, ASQSIGNQR :TQ BELL TELEPHONE LABORA- TQEIES, QNCQMRQPQRATED, ;N,E\V YORK, 'N'. Y., A ,CORPORATION QF YORK .swrenme .enerm- Appliatien filed Mar'h 8.1, 192,7. 4Serial No.

This invention rela-tes to switching sys- 1eme., end Inere pertienlnrly te on e-.r'renge ment forl vSwitching ther tle'ijminals lO f tWO Linee, at both endstheeO-f, simultaneou'sly.

',In program transmission, such 'as rjiidio broadcasting, when fick-np micr- Pnene le .Connected with te transmitting een-tien ley menne' 0.1 n toll .ene'nt .it is ,seinetnr'ee' deereblete provide 'e Sfeeond o r 'nenwnng .eil-.cnn .oye which .the @meeneemt teln eetnnlnnefetien with "en .attendent et the trnninlt'ting stat-inn'- In 1eee'ethe errent, over wlreh en impert-gnt pogrtm i s being transmitted, Shonll beeem'e noisy er ethenyyee .fell to innetefn Preper-lyt'is Qbvionsly desirable to ,substitute .enotner'eir'ent therefor es quickly es Reeebgle, and the. rneln .fe-etere 'of this' ifnvention .is en' arrangement Whfe'reby 'meene'een- @rolled .either by' .the tra-nellnttne Station 'et-- tnent, 'the enno'nneer en effen nient-fthe toll .otleeS ,et the ends .of ,the eine lines, iS

of both .toll linee in nnen .o manner' thee-the program ie ltneneened .te .the ,line originally need for .nrenterng'pnrpoee'e' and the nonneer ie'eonneeted with .the ffne-nemifttng s'tgttio'n over the defeetiye circuit". which ne en ...eielnt-ly 'operative to Serve' e monitering' .1lren1t 'during .the eflnerge'ney 'Tll'e 'invention will 12e understood freni the following description when rend in .Coni junction .with the dra-Winge:

Fig. 1 ot which pepresenlts the -Circuit ai'- rzingfelment and ,apparatus at the pick-up enel'; and

Eig. 2 represents the incoming or trainsmitt-ng station end.

,Referring to the drawing a, pick-up microphone 1 is connected Witii the ti'ginSi'nittei' (not shown) of a broadc-isting staltionl2 over tiugnlt circuit. 3, patching cord 1, toll line `l L, vpatching cord 5 and' twink circuit 6.

The announceirs telephone set 7 is .shown connected with an attenolqnts telephone 8` :tt 4the broadcasting station', .ovei` n. trunk c ircuit 9. patching cord 10, tool line L2,.pa,tcl1 ing cord 11 and trunk cincuit 12.

'leneetfne Celle 13 and 11 ere feonneeted in each end of the trunk circuit 9 which terminates in the toll test board jaek l5 at the tel-l etlee- The Sleeve 01,15. '1S eenneeted te the mid-.peint of the line Winding elle Program Supply Sonre e.,` hereinafter ,ref terre@ te es .the'"pieknn nelnt, ,een man1-- onfl repeating coil 14 `angl the 1n'iidi'po'int of the line Winding o f iepeat'ing coil 13 ifs'connecte'd .to A 'litey I {1",'.`0n e eide of which is grounded, thereby providing. e circuit' :for operating reley' 16, WleneeliS le'entl llnre e'onneeted by thepntehn-eerl 1.0 and ,Kx 'is opere-ted.; .Second 'key 2K2', Vloeei'fesl` .et the toll office, 'is' .''ls'o arranged fori', operating 'xfe leyllfrernthat iont,[i..f`eiei're1` 'The @Selektion-tlf the. erlelit'. r.1.1...n0W be deeenbeslf .liet it' be. .ennrnedtliat e meenam' le being '.inelred-.n -by the '.mienphon 1 end tlrnnenltteid olien/'tell' line' .Li to' 'j'.the bnoeleeetn". ee-ten'and 'that the enne'. neer nl the P'e'lnn ,point1.e Connected .wit Aen @tendent et ,therbroedeneting.St-@i911wel; fi @10.1.1 lineman@ .fmheri,'eneeee1.1nne L. Suddenly .beeenres vnoey orlotheryvee fei-l's le 'n.lenerly titnetnitfthe f'grogner'n, vehell feet lbe'eornes known nnrnelntelygto .either the e-ttendnnte't thefbroedeeeting attitiQmthe ennoni'ter et th'ejpiekup1i0-lgt .I :een Attendmit @t .once of "the -tolfqfce'sh'n 'which the linespL.' .and .112..t-ern1'inete# It will' ne inlener 'eesn'rned that the em-I nonncer, being 'appraised `oftl1e'tioub1e,` dcsires ,tig 1.1.1L1iriedi2ltely tranjsfe'mthe. p nogl'nlll from :line Q1' t line L2. lHetlherelfore'momentarily .ltpressee key. AK1 whieh-.eloees 'nn obyon'e e'ireuit fo.r';relay`. 1.6 .of theieemnoste f ingeroxxl which" nele in operating, qloeg eil'rctiittoolperate A.e :iy which may be' traced fifoin gnonnd'gttthe ighthand .contact'f rel'a'y 16, .oyer '1ead .fand the left bend nerfrnel slenteren-.orf 'relay 19. to battery through .the winding .of nely 1,8. The 'elosure .of the contaets' 'of nele'y 18.p 1;0vides ,an energizing 'ein'ent `forjlzelay 1,9 and holding'cii'cui't; fgnrel'ay' 1 8 when relay 16 relezises", yyvhiehdcircnt-may'he trlaced from grotind oyerthiecontactfof Sleeve relay 2O of the jack 21, which relay will be .operated during the time patoliing coi-.tl 41 is plugged into nekSfQl andr22, Contant-S. -23 of nele-y 24, eonteele of ,relay 1.8., Winding of-reley 19 and Winding 0f relay 18 to battery- .RelayS 18 and 19 nre non' held operated in Series under 'control of relay 24. lVhen'relay 19 operates it connects ground et its right hand oont-aets toopera-te'releys -25 end-26-Whid1 intertchange llines L1 and'Lz .with -respect to jacks 21 and 17 so that the pick-up microphone is new connected to line L2 Aand the announcer-s .telephone set :to `line L1- -rellny 16 operated it also connected f ringing current of an suitable frequency, which may be within t e voice range and of the order of 1,000 cycles, to line L2 to actuate relays, not shown. of the composite ringer CXX2 at the other end ofthe line. =The composite ringers CXXI and CXX2 being exactly alike, it is believed that the operation of the circuit will be understood from the arrangement of the ringer CXXI, the cir'- cuit of which is shown in detail. The ringing current transmitted over line L2 1n response'to the 'energization of relay 16 is received at the composite ringer CXX2 over leads 44 and. 4.5 vhi ch correspond to leads 46 and 47'of Athe'ringer CXXl and passes through vthe primary winding of a transformer 'corre'sp'ondi'ng to winding 27 as shown in ringer CXXI'. The current generated in the secondary winding ofthis transformer afectsthe grid ofv a'vacuuin tube device corresponding to`28,lthe output circuitof which. includes a relay corre-V sponding to relay 29 which'lias a vibrating armature. The* alternating 'current impulses from the line `passing through the transformer are amplified by the vacuum tube corresponding to: 28 and cause the armature of the relay corresponding to 29 to vibrate between itsv contacts thereby causing an alternating current to be generated in the circuit which includes arelay corresponding to 'relay 31 which relay thereupon operates to short-circuit a. normally energized 'relay corresponding to relay 32 which thereupon releases and connects ground to lead 33 corresponding to lead 43 of ringer CXXl to operate relay 34 of Fig. 2 which corresponds to relay 18 of Fig.I 1 Relay 34 operates and when ground is removedfrom lead 33 due'to the cessation of :the ringing impulses relay 35 will be energized in series with relay 34from ground supplied at the front Contact of relay 36 which relay is energized d ue to the connection of jacks 37 and 38 by patching cord' 5. The operation of relay 35- connects ground, at its left hand contacts, to relays 39 and 40 which transpose lines Ll and L2 with respect to jacks 37 and'42 simultaneously with the operation of relays 25 and 26. Relays 34 and 35 are held energized in series under control ofrclay 41.

Composite ringer CXX2 being exactly like ringer CXXl, it will be evident that the same series of opera-tions may be initiated from the"broadeast station end of the line by the depression of either key K3 or 4.

Now let it be assumed that lines Ll and L2 have been transposed as previously described and the announcer at the pick-up point or the test board attendant at the toll office desires to return them to their original position, i. e., line L, connected to jack 21 and L2 to jack 17. This `transfer will be effected by momentarily depressing either key Kl or K2 which -will again enervizeJ relay 16 which in turn connects grounc to lead 43 thereby closing an"eneigizing circuit for relay 24`,--Which relay up to the present time has not been operated. This circuit-may be traced over the make contacts of relay 19 which are closed due to the fact that relays 118 andY 19 are locked up to ground at relay 20 under control of relay from ground .over the ,right/.hand contacts of relay 16, lefthand makecontact ofrelay 19, make Contact of relay 4 24,- contacts .of relay v18', windingof 4relay and winding of relay 18 tobattery and'g'roundlfWhen `re-A lay 16' is deenergized d e tetlie release of the depressed key, the cirjc'uitjf or` relays. 18 and 19 isbroken andthese relaysI restore to normal thereby. o'penin'v the circuit `for relays 25 and 26 which t ereupon 'release and transfer lthe conductorsfof lines- L1 and L., backto jacks 21`,and 1f7,.`respecti y ely vThe operationhof irelay 1 6 ,also connects alternating currentrto line'L'nfwhich at the time is connected tofcoinpositeringer'GXX2 atthe otherfend of the.line, by means of leads 44 and' 45, This causes, the release of a relay -corres ending lto relay 32 of ringer CXX1, thereliy connectin ground over lead 33 to cause the operatidn'of relay 41. The removal of ground from lead 33, upon cessation of the `rin`ging.` i mpulse, releases relays 34and 35 which in turn causes the release of relai-ys 39 and '40 'to transfer the lines Ll and L2 back1 into connectionwith jacks 42 and 37, respectively. A'lfherelease of relays 19 and '35 release4 relays 24 and 41 thus restoring thel circuit to normal.' Y

It should be understood 'f om the foregoing description that operation of any one of the keys K1, K2, K3 o'r Kgwhen the circuit is normal, causes relays 25, 26, 39 and 40 to simultaneously operate Ito transpose lines LL and L2 with respect to'jacks 2 1 and .17 at one end and jacks 142 and 37 at the other end, and when these' relays are operated the actuation .of any of theabove mentioned keys causes the release of these. relays to restore the lines to their original connections'.

What is claimed is:

1. In an electrical system, two circuits, outgoing terminals for each circuit at one end thereof and incoming terminals therefor at the other end, and means controlled in part over one circuit for simultaneously inter-changing both ends of said circuits with respect to'their terminals. I

2. In an electrical switching system, two lines, outgoing terminals for each line at one end thereof and incon'iingjr terminals therefor at the other end, and means, includingV a voice frequency operated composite ringer, controlled iu part over one line for simultaneously interchanglingr both ends of said lines with respect to their terminals.

2i. In an electrical switching system, two lines, outgoing terminals for each line at one end thereof and incoming terminals therefor at the other end, and means, including a Voice frequency operated device, controlled in part over one line for simultaneously intei-changing` both ends of said linesI with respect to their terminals.

4. ln an electrical switching system, lines terminating in switching terminals at both ends thereof, and switching apparatus interposed in all of said lines at each end thereof for Simultaneously interchanging both ends of all of said lines with respect to said terminals, said switching apparatus being in part controlled over one of said lines from either end thereof.

In an electrical system, lines terminating in switching terminals at iboth ends thereof, switching` apparatus interposed in all of said lines at each end thereof for simultaneously interchanging both ends of all of said lines with respect to said terminals, said switchingV apparatus being in part controlled over one of said lines from either end thereof hy means of alternating current of a frequency Within the voice range.

In Witness whereof, hereunto Subscribe niv name this 29th day of March, A. D.,

PAUL B. MURPHY. 

